Temp Sender for Gauge on a 3100

[3pt1lumina]

Temp gauge stopped working and I'm assuming it's the sender. It's my dad's Malibu but still has a 3100, so I'm assuming it's all the same in terms of location. Can someone post a pic with an arrow or just describe it to me in general where it is? And is it easy to change? Never done one before on a 3100...only on old school cars.

[Crazy K]

if it has a 3 wire, it is located below the the thermostat...

 

if that sensor is a two wire, the gauge sender is on the drivers side rear head, with one green wire.

[3pt1lumina]

The sensor by the thermostat is a two wire. So on to the back head I go.

 

One more question. When the gauge failed, the auxiliary fans started running. Now, whether the compressor is on or off, the fans are always running, as if the A/C was on. Am I still correct in my diagnosis that the temp gauge sender is the culprit, or do I go searching for something else?

[Crazy K]

if the fans are running full time, they are triggered by the ECM sender failing which is the sensor by the t-stat.

 

I recommend

 

replace ecm temp sensor AND T-stat.

[3pt1lumina]

Perfect, I will get on that this week. Thanks for the info, I'll let you know if all is well.